Design, fabrication, and validation of passive wireless resonant sensors for NDT/SHM

Iervolino, Onorio; Jenks, C. H. J.; Meo, Michele

doi:10.1117/12.2046633

Cited by 2 publications

(4 citation statements)

References 18 publications

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“…In a previous work we reported the influence of the sensor design on the capacitance and inductance of the equivalent electrical lumped model and how the electrical nature of the materials on which the sensor is attached/embedded affects the resonant frequency of the sensor. Indeed the presence of flaws cause opposite effect on carbon and glass fibre composites, resulting in increasing the value of the resonant frequency for the conductive samples as the defect increase, instead for non-conductive structures the resonant frequency decrease with the "magnitude" of flaws [22].…”

Section: Figure 3 Loop Antenna Connected To a Rf Network Analyzer Powmentioning

confidence: 99%

“…The sensor reported is simple resonant circuit sensor, which consists of square spiral inductor, characterized by a single conductive trace (copper) on a dielectric substrate, with the turn's spiral all the way to the centre of the coil. In our previous work we presented the Spiral Passive Electromagnetic Sensor (SPES) device [22] as sensor for NDE/SHM for composite samples. In the work reported here we are investigating the capability of the sensor to detect damage and give information on the dimension of the flaws.…”

Section: Introductionmentioning

confidence: 99%

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Spiral passive electromagnetic sensor (SPES) for smart sensing and de-icing

Iervolino

Meo

2015

SPIE Proceedings

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The objective of this work was to develop a wireless Spiral Passive Electromagnetic Sensor (SPES) to monitor the complex permittivity of a surrounding medium. The sensor is a self-resonating planar pattern of electrically conductive material. Investigation were conducted to demonstrate the capability of the SPES to monitor humidity and temperature gradients, and acting as an ice protection tool. An oscillating signal is used to interrogate remotely the sensor with a single loop antenna or wiring it directly to a spectrum analyser and monitoring the backscattering signal. The excited sensor responds with its own resonant frequency, amplitude and bandwidth that can be correlated to physical quantities to be monitored. Our studies showed the capability of the sensor to monitor temperature and humidity changes in composite materials and uniformly produce induction heating when the conductive path is activated by an external electric power supply that can be used for deicing of aircraft structures.Downloaded From: http://proceedings.spiedigitallibrary.org/ on 08/28/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx INTRODUCTIONFor many years engineers have been searching for ways to obtain information on how structure is behaving in service by incorporating, at the time of construction or subsequently, sensing devices which can provide information about their health such as strain, temperature, humidity, and the presence of defects (e.g. crack, delamination, porosity, etc.). In the recent years structures and infrastructures tend to contain more integrated sensors in order to collect data on its health and/or on different environmental parameters [1,2]. Moisture is one of the largest concerns for building since it is the single most important agent of building deterioration [3]. Moreover the control of relative humidity and temperature is essential for improving the aircraft cabin air quality [4]. Whereas nowadays temperature measurements can be performed with a satisfactory accuracy, measurement of humidity results much more complex [5,6]. The highest percentage of the current humidity sensors are based on the capacitive technique, have the feature of ease fabrication, low power requirement and linear response [7,8]. Nowadays, with the steady increase of the use of composite materials in the aerospace industry, a significant amount of work has been conducted for the development of non-destructive inspection as well as for structural health monitoring system [9,10]. Furthermore, for an effective monitoring of flaws within the structure a large number of sensors distributed over a large area are required. The presence of multiple sensors on the same structure require the use of complex algorithm for the analysis of the data [11,12]. Most of the sensors actually used for monitoring humidity, temperature or for SHM system are single-functional elements. This require the use of a sensor network were different device are integrated. The health of structures could be strongly affected also by the presence o...

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Section: Figure 3 Loop Antenna Connected To a Rf Network Analyzer Powmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spiral passive electromagnetic sensor (SPES) for smart sensing and de-icing

Iervolino

Meo

2015

SPIE Proceedings

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“…The sensor does not present any electronic circuit, but rather an inherent capacitance due to the geometric design and the inductance represented by the spiral metal trace. More information, on the working mechanism of the SPES device are reported in our previous work [8]. Three different sensor designs (K3, K6 and K10) were tested and embedded within glass fiber composite sample.…”

Section: Sensor Descriptionmentioning

confidence: 99%

“…The SPES is a resonant circuit sensor, which consists of square spiral inductor, characterized by a single conductive trace on a dielectric substrate. In our previous works we presented the SPES device as sensor for NDE/SHM for composite samples [8], and as temperature-humidity monitoring and anti-icing/de-icing device [9]. We investigated the capability of the sensor to detect and localize the presence of material deposited on the surface.…”

Section: Introductionmentioning

confidence: 99%

Spiral Passive Electromagnetic Sensor (SPES) for composite structural changes in aircraft structures

Iervolino

Meo

2016

SPIE Proceedings

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A major goal of structural health monitoring (SHM) is to provide accurate and responsive detection and monitoring of flaws. This research work reports an investigation of SPES sensors for damage detection, investigating different sensor sizes and how they affect the sensor's signal. A sensor able to monitor structural changes that can be remotely interrogated and does not need a power supply is presented in this work. The SPES-sensor presents the great advantage of monitoring conductive and non-conductive structures such as fiberglass-reinforced composites (FRC) and carbon fiber-reinforced polymers (CFRP). Any phenomena that affect the magnetic field of the SPES can be detected and monitored. A study was conducted to investigate the capability of sensor to give information on structural changes, simulated by the presence of an external mass placed in the proximity of sensor. Effect of different positions of the SPES within the sample, and how to extend the area of inspection using multiple sensors was investigated. The sensor was tested embedded in the samples, simulating the structural changes on both sides of the sample. In both configurations the sensor described herein demonstrated a great potential to monitor structural changes.

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Design, fabrication, and validation of passive wireless resonant sensors for NDT/SHM

Cited by 2 publications

References 18 publications

Spiral passive electromagnetic sensor (SPES) for smart sensing and de-icing

Spiral passive electromagnetic sensor (SPES) for smart sensing and de-icing

Spiral Passive Electromagnetic Sensor (SPES) for composite structural changes in aircraft structures

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